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STMicroelectronics SM30T12CAY
- Part No.:
- SM30T12CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM30T12CAY.pdf
- Description:
- TVS DIODE 10VWM 17VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,271
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Product details
Overview
SM30T12CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity in 12 V vehicle systems. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 17 V (max) under 176 A surge, and maintains ≤0.2 µA leakage at 25 °C with 12 V stand-off voltage (VRM).
For engineers reviewing the SM30T12CAY datasheet, SM30T12CAY pinout, SM30T12CAY application, or SM30T12CAY equivalent, this device supports high-reliability automotive power line protection where low junction capacitance (<100 pF), AEC-Q101 qualification, and 175 °C operating junction temperature are critical selection criteria.
Technical Context
This bidirectional TVS uses planar silicon technology to achieve stable breakdown voltage (VBR = 11.4–12.6 V at 1 mA), low dynamic resistance (RD = 7.78 mΩ), and predictable clamping behavior across temperature (αT = 10 × 10⁻⁴ /°C). Its symmetrical I-V curve enables robust protection against both positive and negative transients without polarity dependency.
It meets stringent automotive surge standards including ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), while exceeding IEC 61000-4-2 Level 4 ESD (±30 kV air/contact) and ISO 10605 (C = 330 pF, R = 330 Ω) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 3000 W - sustains automotive load dump and switching surges without failure |
| Clamping Voltage (VCL) @ IPP = 176 A | 17 V max - limits downstream IC voltage stress during ISO 7637-2 Pulse 3b |
| Stand-off Voltage (VRM) | 12 V - matches nominal 12 V battery rail; blocks normal operation leakage |
| Leakage Current (IRM) | 0.2 µA at 25 °C - minimizes standby power loss in always-on modules |
| Junction Temperature Range | −55 to +175 °C - supports under-hood placement near engine control units |
| ESD Withstand (ISO 10605) | ±30 kV air/contact - exceeds automotive ESD immunity requirement for body harness interfaces |
| Dynamic Resistance (RD) | 7.78 mΩ - ensures fast, low-voltage clamping response during fast-rising transients |
Pinout & Package
The SM30T12CAY is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads and IPC-7531-compliant footprint. It features two terminals with symmetrical bidirectional conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; no polarity marking required for bidirectional operation |
| Case (cathode side marking) | Thermal and mechanical anchor | Exposed copper pad on PCB provides thermal dissipation path to copper pour |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including temperature cycling, HTRB, and ESD |
| Low leakage current | ≤0.2 µA at VRM = 12 V ensures minimal impact on battery drain in sleep-mode ECUs |
| High junction temperature rating | 175 °C max Tj enables placement in high-ambient zones such as power distribution boxes |
| JEDEC SMC outline compliance | Guarantees mechanical compatibility with standard automated assembly equipment and reflow profiles |
| UL94 V0 flammability rating | Ensures flame-retardant housing integrity during overvoltage fault events |
Applications
| Body Control Module (BCM) Power Input | Infotainment Head Unit CAN Bus Protection |
|---|---|
Use Scenario: Protects BCM 12 V supply input from alternator load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and LDOs. Use Value: Limits transient voltage to ≤17 V, preventing damage to 24 V-tolerant regulators and microcontrollers. | Use Scenario: Shields CAN transceiver I/O lines from ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: Bidirectional shunt clamp on CAN_H/CAN_L differential pair. Use Value: Maintains signal integrity by clamping ±30 kV ESD pulses within <1 ns, preserving bit error rate. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver Interface |
Use Scenario: Guards image sensor and ISP power rails against ignition noise and battery reversal spikes. IC Role / Device Role / Timing Role: Secondary overvoltage protector after primary fuse and filter stage. Use Value: Delivers 3000 W surge handling without degradation, supporting ASIL-B functional safety goals. | Use Scenario: Protects gate driver logic inputs from inductive kickback during motor phase switching. IC Role / Device Role / Timing Role: Fast-response clamp on low-voltage control signals feeding half-bridge drivers. Use Value: Clamps 112 V Pulse 2a transients within 100 ns, avoiding false shutdowns in torque control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Lower PPP (400 W), higher VCL (23.2 V @ 17.3 A), SMC package | Not rated for ISO 7637-2 Pulse 1 or Pulse 3a; limited to basic ESD/surge | Select only for non-automotive 12 V systems with lower surge energy demands |
| TPSMB12CA | Same SMC package, 600 W PPP, VCL = 19.9 V @ 30.1 A, AEC-Q101 qualified | Lacks ISO 7637-2 Pulse 1 (−150 V) validation; insufficient for load dump | Acceptable for ESD + moderate transients but not full automotive power line compliance |
Compared with SMAJ12CA and TPSMB12CA, SM30T12CAY uniquely combines 3000 W surge capability, full ISO 7637-2 compliance, and AEC-Q101 qualification-making it the only option suitable for front-end protection in ASIL-C-relevant power domains.
Availability
SM30T12CAY is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, infotainment head units, and electric power steering systems requiring stable component supply across extended production lifecycles.
Supply support for SM30T12CAY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.
The SM30Txx series belongs to ST's automotive-grade TVS portfolio, engineered specifically for robust protection of 12 V and 24 V vehicle electrical architectures against ISO 7637-2, ISO 10605, and IEC 61000-4-4 threats.
FAQ
What is the maximum clamping voltage for SM30T12CAY under a 176 A surge?
The maximum clamping voltage (VCL) is 17 V when subjected to a 10/1000 µs waveform at 176 A, measured at Tamb = 25 °C. This value increases slightly with junction temperature due to the αT coefficient (10 × 10⁻⁴ /°C), reaching ~17.8 V at Tj = 125 °C per datasheet calculation.
Is SM30T12CAY unidirectional or bidirectional?
SM30T12CAY is a bidirectional TVS diode, indicated by the "C" in its part number suffix. Its symmetrical breakdown characteristic protects against both positive and negative transients on the same line, making it ideal for differential buses like CAN or unprotected power rails subject to reverse battery conditions.
Does SM30T12CAY meet AEC-Q101 requirements?
Yes, SM30T12CAY is fully AEC-Q101 qualified. Test reports confirm compliance with stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114, validating its reliability for automotive under-hood and cabin applications.
What is the recommended PCB footprint for SM30T12CAY?
The recommended footprint follows IPC-7531 and JEDEC MO-136 standards: 5.11 mm × 8.19 mm pad length, 3.14 mm pad width, with 1.54 mm solder mask opening per end. Thermal relief to internal copper planes is advised to maintain ≤175 °C junction temperature during surge events.
SM30T12CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM30TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 10V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 176A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM30T12CAY FAQ
1.How can I place an order for SM30T12CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM30T12CAY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM30T12CAY reliable?
The price and inventory of SM30T12CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM30T12CAY is usually 5 days.
3.What payment methods are accepted for SM30T12CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM30T12CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM30T12CAY?
SM30T12CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM30T12CAY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM30T12CAY?
For technical support, including SM30T12CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM30T12CAY requirements.
6.How does Aetrix verify that SM30T12CAY is sourced from the original manufacturer or authorized distributors?
All SM30T12CAY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM30T12CAY meets industry standards.
7.What is the process for return or replacement of SM30T12CAY?
All SM30T12CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM30T12CAY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM30T12CAY part is unused and in its original packaging.
Return procedure for SM30T12CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM30T12CAY Tags
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